The Development of Fire- and Heat-Resistant Coatings Based on Chlorosulfonated Polyethylene with Improved Adhesion to Ru
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Development of Fire- and Heat-Resistant Coatings Based on Chlorosulfonated Polyethylene with Improved Adhesion to Rubber N. A. Keibala, *, V. F. Kablova, N. O. Tsybul’koa, and V. V. Ismailova aVolzhsky
Polytechnic Institute, Branch of Volgograd State Technical University, Volzhsky, Volgograd oblast, 404103 Russia *e-mail: [email protected] Received August 6, 2019; revised December 18, 2019; accepted January 14, 2020
Abstract—The main properties of compositions based on chlorosulfonated polyethylene modified by pyrolyzed polyvinyl alcohol fiber have been investigated. The potentialities of application thereof as coatings with increased fire-and-heat protection and adhesion properties for elastomeric materials is considered. Keywords: fire- and heat-protection coating, chlorosulfonated polyethylene, pyrolyzed polyvinyl alcohol fiber, adhesion DOI: 10.1134/S1995421220040085
INTRODUCTION In connection with the widespread application of elastomeric materials for the insulation of electrical cables, for covering floors, for manufacturing hoses, conveyor belts and for other purposes, there is a need to develop low-combustible rubbers, the combustion of which should cease with the removal of the source that causes the ignition. In the case of the retention of good operational rubber properties of rubbers, this is not always possible. One of the solutions to this problem consists in the use of elastic coatings that exhibit a fire- and heat-protective effect. However, one should take into account that a high value of bond strength between the coating and the material under protection. Chlorosulfonated polyethylene is one of the most promising and widely used polymers for the production of protective coatings having a certain fire-retardant ability [1]. The development of methods for improving the efficiency of fire- and heat-protective coatings is an important problem, for the solution of which fibrous fillers are increasingly used. Carbon fibers occupy a special place among them. However, they are chemically inert and have a smooth undeveloped surface, which causes insufficient bond strength with respect to the elastomeric matrix and, as a consequence, leads to a decrease in the cohesive strength of the material. To increase the adhesion strength between the fibers and the matrix and to improve the distribution of the fibers, it is necessary to introduce special chemical additives—adhesion promoters—into the composition, or to carry out a preliminary surface modification of the fiber with the use of coupling agents.
It is known that carbon fibers can be obtained by the pyrolysis of a number of synthetic fibers. The potentialities of the production of carbon fibers from polyvinyl alcohol fibers were proven at the beginning of the last century, but the technology has not found much application owing to a low product yield [2]. At the present time, owing to modification, the yield of carbon fibers could be significantly increased. In the modern idea of fire protection for polymeric materials, researchers and technologists incre
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